Method for detecting percentage of contact area of matching surface of part

Abstract

The invention discloses a method for detecting the percentage of the contact area of matching surfaces of parts. The method comprises the following steps: 1) selecting a part A and a part B with matching surfaces; (2) a coloring agent is evenly smeared on the matching face of the part A; (3) the part A and the part B are assembled, and the matching surfaces are tightly attached; (4) the part B is taken down, and the coloring agent attached to the part B is rubbed to rubbing paper; 5) calculating the coverage area of the coloring agent on the rubbing paper, and 6) finally calculating the percentage of the contact area of the matching surfaces of the part A and the part B. According to the method, the contact area of the matching surfaces can be quantified efficiently and accurately, and the uniformity of the coloring agent is improved by converting the coloring position and method.

Description

Technical Field

[0001] The present invention relates to the technical field of component contact surface detection, and in particular to a method for detecting the contact area percentage of a component matching surface. Background Art

[0002] In recent years, with the increasing requirements for mechanical equipment, especially high-precision equipment, the requirements for the mating surfaces of parts are extremely high. The larger the contact area, the better the processing quality of the mating surface. Therefore, in the installation, inspection and maintenance of mechanical equipment, the detection of the contact area percentage (actual contact area / theoretical contact area) between the mating surfaces of parts is often involved. For example, the meshing surface of the gear, the mating surface of the tapered pin shaft (taper pin bolt) and the tapered pin hole, etc., when the contact area is lower than a certain value, it often affects the service life and transmission efficiency of the mechanical equipment, and causes wear and noise, etc. Therefore, it is very important to ensure the percentage of the contact surface of these important parts, which requires repeated grinding of the metal contact surface, and the detection of the contact area percentage is an important indicator for evaluating whether the contact surface is qualified.

[0003] The existing contact area percentage detection method is to apply colorant on the mating surface of a certain part, then make the two parts contact, and judge the contact area percentage of the mating surface by observing the indentation with the naked eye. This method is relatively subjective and cannot efficiently and accurately reflect the processing quality of the mating surface. For example, in the tooth surface contact inspection between meshing gears, colorant is applied on a certain tooth surface, the gear is rotated to make it mesh, and the tooth surface contact condition is judged by checking the tooth surface indentation; for the taper pin bolt and the taper pin hole, colorant is applied on the taper pin bolt conical surface, and then the taper pin bolt is contacted with the taper pin hole, and the contact condition is judged by observing the area of ​​colorant attached to the taper pin hole. However, the above methods all have two disadvantages: one is that the actual contact area percentage cannot be calculated efficiently and accurately, and the other is that the uniformity of the colorant is greatly affected by the operator, which has a greater impact on the coloring effect. Summary of the invention

[0004] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to solve the problems of low detection efficiency, great influence of operators and low accuracy of the existing detection methods, and to provide a detection method for the percentage of contact area of ​​the mating surfaces of components, which can efficiently and accurately quantify the contact area of ​​the mating surfaces, and improve the uniformity of the colorant by changing the coloring position and method.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is as follows: a method for detecting the contact area percentage of the mating surface of a component, characterized in that it comprises the following steps: 1) Select two components A and B with mating surfaces, where the theoretical contact area between components A and B is S1; 2) Apply colorant evenly on the mating surface of component A, then assemble component A and component B and perform relative movement to further evenly apply colorant on the mating surface of component A; 3) Clean the colorant on component B, then reassemble component A and component B and make the mating surfaces close together; 4) Remove component B and rub the colorant attached to component B onto a rubbing paper with a uniform grid; 5) Calculate the colorant coverage area on the rubbing paper, which is the actual contact area S2 between parts A and B; 6) Finally, calculate the contact area percentage of the mating surfaces of parts A and B as: S2 / S1.

[0006] Furthermore, the grid distribution area of ​​the rubbing paper is larger than S1 and can completely rub S1.

[0007] Furthermore, it is characterized in that the colorant is blue oil.

[0008] Furthermore, in step 4), the rubbing paper is folded along the grid lines, keeping the grid lines outward, wherein the grid distribution area after folding can still be completely rubbed S1, and then the grid side of the rubbing paper is covered on component B along the folded grid lines to complete the rubbing of the mating surface of component B.

[0009] Furthermore, the grid on the rubbing paper is a square grid with a size of 0.1×0.1 mm, 1×1 mm or 10×10 mm.

[0010] Compared with the prior art, the present invention has the following advantages: 1. By changing the coloring position and method through two contacts, the uniformity of colorant application on the precision matching surface can be increased, which can effectively reduce the inspection error caused by uneven colorant application.

[0011] 2. Using grid rubbing paper for rubbing can quickly and accurately calculate the contact area percentage of the precision matching surface, and can efficiently and accurately quantify the contact area of ​​the precision matching surface, making the inspection result more objective.

[0012] 3. The rubbing method can more accurately record and save the contact area percentage of the precision matching surface, which is conducive to later traceability. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of rubbing paper.

[0014] Figure 2 This is a schematic diagram of the folded rubbing paper.

[0015] Figure 3 Illustration of the parts after applying stain.

[0016] Figure 4-Figure 6 This is a flow chart of the operation of the tapered pin bolt and the tapered pin hole.

[0017] Figure 7 Schematic diagram of the colorant applied to the taper pin bolt.

[0018] Figure 8 Schematic diagram of the rubbing paper after rubbing the contact surface.

[0019] In the figure: 1—rubbing paper, 1—colorant, 1—taper pin bolt, 1—taper pin hole part. DETAILED DESCRIPTION

[0020] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0021] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. In the description of the present invention, it should be noted that the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the invention product is usually placed when used, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance. In addition, the terms "horizontal", "vertical", etc. do not mean that the components are absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted. In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] Embodiment: A method for detecting the contact area percentage of a component mating surface comprises the following steps: 1) Select two components A and B with mating surfaces, where the theoretical contact area between components A and B is S1.

[0024] 2) Colorant is evenly applied on the mating surface of component A. As an implementation method, the colorant shown is blue oil, which has a better coloring effect and is easy to apply evenly. Then, component A and component B are assembled and move relative to each other, so that the colorant on the mating surface of component A is further evenly applied.

[0025] 3) Clean the colorant on part B, then reassemble parts A and B and make sure the mating surfaces are close together.

[0026] 4) Remove component B, and print the colorant attached to component B onto a rubbing paper with a uniform grid; wherein the grid distribution area of ​​the rubbing paper is larger than S1, and can completely print S1. wherein the grid on the rubbing paper is a square grid, and the size of the grid is preferably 0.1×0.1mm, 1×1mm or 10×10mm. in the actual detection process, it is determined according to the contact area accuracy requirements. if the contact area accuracy requirement is at the millimeter level, the maximum size of the grid on the rubbing paper is 1×1mm. in the specific rubbing process, fold the rubbing paper along the grid line, keeping the grid line outward, wherein the grid distribution area after folding can still completely print S1, and then cover the grid side of the rubbing paper along the folded grid line on component B to complete the rubbing of the mating surface of component B; in this way, the edge of the rubbing paper can be prevented from affecting the rubbing accuracy.

[0027] 5) Calculate the colorant coverage area on the rubbing paper, which is the actual contact area S2 of parts A and B. In actual calculation, since the grid is uniform and the area of ​​the grid is known, for completely covered grids, it is sufficient to calculate the number of grids covered by the colorant on the rubbing paper. For incompletely covered grids, it is sufficient to estimate the area based on the ratio of the area of ​​the covered part of each grid to the area of ​​the grid. Since the uncovered area is generally a small part of the edge area, the area can be quickly obtained by estimating the area without affecting the overall area within the rubbing range. In this way, by adding the two areas, the colorant coverage area can be quickly calculated.

[0028] 6) Finally, calculate the contact area percentage of the mating surfaces of parts A and B as: S2 / S1.

[0029] As an example: Taking the detection of the contact area percentage between the tapered pin bolt 3 and the tapered pin hole of the tapered pin hole part 4 as an example, wherein the matching surface between the tapered pin bolt 3 and the tapered pin hole is a tapered surface, the specific operation is as follows: Prepare a piece of rubbing paper with a uniform grid, such as Figure 1 As shown, the total area of ​​the grid on the rubbing paper 1 is larger than the surface area S1 of the matching surface between the cone pin bolt 3 and the cone pin hole; then fold the rubbing paper 1 along the grid line, keep the grid line outward, and ensure that the grid distribution area can still be completely rubbed S1 after folding, as shown in FIG. Figure 2 shown.

[0030] Place the part 4 with the taper pin hole vertically, with the large end of the taper pin hole facing upwards, and then evenly apply a layer of blue oil (or other colorant 2) on the inner wall of the taper pin hole. Figure 3 shown.

[0031] Then put the cone pin bolt 3 concentrically into the cone pin hole. Figure 4-Figure 6As shown, after the tapered pin bolt 3 lightly contacts, the tapered pin bolt 3 is rotated 180° in the tapered pin hole, and the blue oil (or other colorant 2) in the tapered pin hole is further evenly applied, thereby reducing the inspection error caused by uneven application of the blue oil (or other colorant 2).

[0032] Then take out the tapered pin bolt 3, clean the blue oil (or other colorant 2) on the tapered pin bolt 3, and then put the tapered pin bolt 3 concentrically into the tapered pin hole again. After the tapered pin bolt 3 fits with the tapered pin hole, gently tap the large end of the tapered pin bolt 3 to make the tapered pin bolt 3 fit with the tapered pin hole as much as possible.

[0033] Take out the cone pin bolt 3 again. Be careful not to let the cone pin bolt 3 and the cone pin hole rotate relative to each other during the removal process. Then gently cover the cone pin bolt 3 along the folded edge with the grid side of the rubbing paper 1. Figure 5 Note that the contact conical surface between the taper pin bolt 3 and the taper pin hole should be completely within the grid range, and there should be no relative sliding between the taper pin bolt 3 and the rubbing paper 1.

[0034] Finally, the development of printing paper, such as Figure 6 As shown, since the grid is uniform and the area of ​​the grid is known, the colorant coverage area S2 can be quickly calculated by counting the number of blue oil-covered grids on the rubbing paper.

[0035] Finally, the contact area percentage between the tapered pin bolt and the tapered pin hole is calculated to be S2 / S1.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit the technical solution. Those skilled in the art should understand that those modifications or equivalent substitutions of the technical solution of the present invention that do not depart from the purpose and scope of the technical solution should be included in the scope of the claims of the present invention.

Claims

1. A method for detecting the contact area percentage of a component mating surface, characterized in that: The steps include: 1) Select two components A and B with mating surfaces, where the theoretical contact area between components A and B is S1; 2) Apply colorant evenly on the mating surface of component A, then assemble component A and component B and perform relative movement to further evenly apply colorant on the mating surface of component A; 3) Clean the colorant on component B, then reassemble component A and component B and make the mating surfaces close together; 4) Remove component B and rub the colorant attached to component B onto a rubbing paper with a uniform grid; 5) Calculate the colorant coverage area on the rubbing paper, which is the actual contact area S2 between parts A and B; 6) Finally, calculate the contact area percentage of the mating surfaces of parts A and B as: S2 / S1.

2. A method for detecting the contact area percentage of a component mating surface according to claim 1, characterized in that: The grid distribution area of ​​the rubbing paper is larger than S1 and can completely rub S1.

3. The method for detecting the contact area percentage of the mating surface of a component according to claim 1, characterized in that: The colorant shown is blue oil.

4. The method for detecting the contact area percentage of the mating surfaces of components according to claim 1, characterized in that: In step 4), the rubbing paper is folded along the grid lines, keeping the grid lines outward, wherein the grid distribution area after folding can still be completely rubbed S1, and then the grid side of the rubbing paper is covered on component B along the folded grid lines to complete the rubbing of the mating surface of component B.

5. The method for detecting the contact area percentage of the mating surfaces of components according to claim 1, characterized in that: The grid on the rubbing paper is a square grid with a size of 0.1×0.1 mm, 1×1 mm or 10×10 mm.

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